testconn.php

<?php

$host = "";
$db = 'onboard';
$user = 'inffel';
$pass = "";

$conn = new PDO("sqlsrv:server=$host,1433;Database=$db", $user, $pass);

$tsql = "select * from usuarios";
//$getProducts = $conn->exec($tsql);
$getProducts = $conn->query($tsql);
$usuarios = $getProducts->fetchAll(PDO::FETCH_ASSOC);
var_dump($usuarios);